An Analysis of Influencing Factors for Vapour Transfer in Freezing Soils in High-filling Engineering DOI Open Access

Zhan-jun Huang,

Xiangdong Sun,

Zuoyue He

et al.

American Journal of Civil Engineering, Journal Year: 2024, Volume and Issue: 12(6), P. 199 - 210

Published: Dec. 25, 2024

Canopy effect has been paid more and attention in high-filling engineering cold arid regions of China. Vapour transfer is considered as the main cause canopy freezing soil literature. However, influencing factors vapour soils have not systematically analyzed Based on coupled heat mass model proposed by authors, effects hydraulic parameters environmental will be this paper. The results show that parameters, such fitting water characteristic curve (SWCC) saturated conductivity, total content are significant, even if values these vary within a quite small range. temperature gradient, cooling rate, flux at top sealing conditions bottom can also lead to an increment volumetric content. Therefore, all promote under suitable conditions. terms related governing equations analyzed. In total, caused large, which then frost damage silt. research paper helpful understand influence for great significance guiding design maintenance engineering.

Language: Английский

Feasibility Experiment and Simulation on Controlling the “Pot Cover Effect” of Subgrade in Seasonally Frozen Regions by Capillary Barrier Layer DOI
Mingli Zhang, Ruiling Zhang, Yaling Chou

et al.

International Journal for Numerical and Analytical Methods in Geomechanics, Journal Year: 2025, Volume and Issue: unknown

Published: April 20, 2025

ABSTRACT The pot cover effect can increase the moisture content in shallow soil, which reduces subgrade strength and may lead to engineering issues, such as pavement cracks deformation. Therefore, studying prevention measures for is essential. This paper proposes preventive measures, inspired by capillary barrier layers used landfills, that involve installing mitigate effect. First, a self‐designed test device was compare hydrothermal changes conventional fill with gravel sand layer seasonal frozen soil environment. Second, water–vapor–heat coupling model developed simulate quantitative water migration induced during experiment. Finally, long‐term of using on loess northwest China simulated. results show at depth 2.5 cm, liquid without increases number freeze–thaw cycles, reaching maximum 5.9%. In contrast, same only 0.9%; vapor flux 1/10 layer. proposed method offers theoretical insights mitigating guiding future designs.

Language: Английский

Citations

0
Pot-cover effect in permafrost embankment: Laboratory experimental reproduction and prevention measures simulation DOI
Yue‐Feng Liu, Mingli Zhang,

Dongmiao Hao

et al.

Cold Regions Science and Technology, Journal Year: 2025, Volume and Issue: unknown, P. 104529 - 104529

Published: April 1, 2025

Language: Английский

Citations

0
Pot‐Cover Effect in Permafrost Embankment: In Situ Experiment Evidence and Mechanism Simulation DOI Open Access
Mingli Zhang, Yue‐Feng Liu, Fei Wang

et al.

International Journal for Numerical and Analytical Methods in Geomechanics, Journal Year: 2024, Volume and Issue: 49(1), P. 166 - 184

Published: Oct. 18, 2024

ABSTRACT Under the influence of large temperature differences in an impermeable pavement layer wide embankment permafrost regions, liquid water accumulates at bottom cover. The phenomenon is known as pot‐cover effect and leads to increase soil content a reduction bearing capacity embankments. At present, vapor migrations their on thermal‐moisture stability have not been fully confirmed. To better understand moisture transport accumulation process within embankments, hydrothermal field monitoring was conducted from 2009 2011 asphalt concrete highway Beiluhe, central Tibet Plateau. results show that between 50 250 cm below continuously increases with number freeze‐thaw cycles, largest during 2 years being 6.4%. Then, coupled hydro‐vapor‐thermal model established verified. Furthermore, used analyze numerical recurrence effect. simulation indicates upward migration freezing period less than downward thawing period, while migrates but period. main cause regions. In addition, research can provide new ideas for understanding internal mechanism dynamics prediction engineering.

Language: Английский

Citations

2
An Analysis of Influencing Factors for Vapour Transfer in Freezing Soils in High-filling Engineering DOI Open Access

Zhan-jun Huang,

Xiangdong Sun,

Zuoyue He

et al.

American Journal of Civil Engineering, Journal Year: 2024, Volume and Issue: 12(6), P. 199 - 210

Published: Dec. 25, 2024

Canopy effect has been paid more and attention in high-filling engineering cold arid regions of China. Vapour transfer is considered as the main cause canopy freezing soil literature. However, influencing factors vapour soils have not systematically analyzed Based on coupled heat mass model proposed by authors, effects hydraulic parameters environmental will be this paper. The results show that parameters, such fitting water characteristic curve (SWCC) saturated conductivity, total content are significant, even if values these vary within a quite small range. temperature gradient, cooling rate, flux at top sealing conditions bottom can also lead to an increment volumetric content. Therefore, all promote under suitable conditions. terms related governing equations analyzed. In total, caused large, which then frost damage silt. research paper helpful understand influence for great significance guiding design maintenance engineering.

Language: Английский

Citations

0